Quote:
Originally Posted by rickcioppa
I was told I should be getting 16-20MPG, is that true?
I'm getting 11, seems run fine.
I can close the GAV and it doesn't seem to make much difference, I run it about a 1/4 open, if I open it more she starts to run rough. After I come off a long stretch at 45MPH and stop to get gas she backfires, it only backfires under this condition. So I'm thinking I need to rebuild carb (Zenith-1).
Any other thoughts? or should I do something else first?
Thanks
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I had this exact issue. A split second after switching the ignition switch off, would get a loud backfire through the exhaust, loud like a shotgun. Had just gotten the truck back from a repair shop, including replacing the carb. Cause was a totally miss-adjusted carb idle mixture screw. Was loading up the exhaust manifold with unburned fuel, engine stop, heat in the manifold ignited the mixture.